Add the brotli compressor for bsdiff

Add a new compressor interface; and the brotli compressor which is
similar to the existing bz2 one.

Also add a new CompressorType argument to PatchWriter's init function;
this allows us to choose the right compressor based on the input option
in the future.

Bug: 34220646
Test:  Run bsdiff/bspatch with brotli compressor/decompressor over a
list of files from angler's system image. Make succeeds.
Change-Id: Id9a3db2d7d051dcb751a1fc362f4c3b9226e878b

1 files changed, 29 insertions, 0 deletions

diff --git a/brotli_compressor_unittest.cc b/brotli_compressor_unittest.cc
new file mode 100644
index 0000000..5b968c3
--- /dev/null
+++ b/brotli_compressor_unittest.cc
@@ -0,0 +1,29 @@
+// Copyright 2017 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "bsdiff/brotli_compressor.h"
+
+#include <gtest/gtest.h>
+
+namespace {
+
+const uint8_t kHelloWorld[] = {
+    0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x0a,
+};
+}  // namespace
+
+namespace bsdiff {
+
+TEST(BrotliCompressorTest, BrotliCompressorSmoke) {
+  BrotliCompressor brotli_compressor;
+  EXPECT_TRUE(brotli_compressor.Write(kHelloWorld, sizeof(kHelloWorld)));
+  EXPECT_TRUE(brotli_compressor.Finish());
+  std::vector<uint8_t> compressed_data = brotli_compressor.GetCompressedData();
+  EXPECT_GT(compressed_data.size(), static_cast<size_t>(0));
+
+  // TODO(xunchang) run brotli decompressor and check we can get back
+  // kHelloWorld.
+}
+
+}  // namespace bsdiff
\ No newline at end of file